For the first time since this global skaters’ waltz began in 1896, the US squad won three gold medals. Ilia Malinin, the “Quad God,” retained his men’s title with half a dozen quadruple jumps, including his signature Axel.

Alysa Liu became the first American women's figure skating world champion in nearly two decades Friday night, dethroning three-time defending champion Kaori Sakamoto with a brilliant free skate that earned her a standing ovation inside TD Garden.